test-lib/src/main/java/org/apache/livy/test/jobs/SharedVariableCounter.java
<gh_stars>0/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.livy.test.jobs;

import java.util.NoSuchElementException;

import org.apache.livy.Job;
import org.apache.livy.JobContext;

public class SharedVariableCounter implements Job<Integer> {

  private final String name;

  public SharedVariableCounter(String name) {
    this.name = name;
  }

  @Override
  public Integer call(JobContext jc) {
    Integer value = -1;

    try {
      value = jc.getSharedObject(name);
    } catch (NoSuchElementException e) {
      jc.setSharedObject(name, value);
    }

    Integer newValue = value + 1;
    jc.setSharedObject(name, newValue);

    return newValue;
  }
}
